Dielectric and tensile behavior of nanoclay reinforced polyetherimide nanocomposites

Abstract

Polyetherimide (PEI)/organoclay (Cloisite 30B) nanocomposite and PEI/pristine nanoclay (K10) nanocomposite were made by solution casting process. Nanoclay content of 0.5, 1.0, 2.0, and 3.0% (by weight) was reinforced in PEI. The dielectric properties (dielectric constant, loss tangent, and electromagnetic transmission/ reflection losses) of PEI/Cloisite 30B were observed lower than PEI/K10 in X band frequency (8 to 12 GHz). Mixed morphology in terms of intercalation and exfoliation was evident in wide-angle X-ray diffraction (WAXD) analysis and transmission electron micrographs (TEM) of PEI/Cloisite 30B. Whereas, in PEI/K10, immiscibility, segregation, and phase separation of K10 were observed in WAXD analysis and scanning electron micrographs (SEM). Tensile properties (tensile strength, modulus, and elongation at break) of PEI/Cloisite 30B were superior to PEI/K10. Reinforcement with 1%, by weight, of Cloisite 30B in PEI resulted in the optimum properties, among all the compositions.

Nanoclay-based Polymer Nanocomposites for Electromagnetic Interference Shielding

“…With 5 wt. % fraction of polyaniline-clay nanocomposite prepared using 3-pentadecyl phenol 4-sulphonic acid (PANICN-PDPSA) and polyaniline-clay nanocomposite prepared using dodecyl benzene sulfonic acid (PANICN-DBSA) conductivity increased to 8.03 x 10 -3 S/m and 8.72 x 10 -3 S/m respectively, similar trends can be seen in papers [7,32]. SEM images shown in Figure 3 demonstrate the formation of interconnected conductive networks in the presence of nanoclay in such nanocomposites at a very low filler concentration and the desired value of electrical conductivity in the range of 10 -1 S/m is shown to be achieved with 5 wt.…”

“…Here, the filler loading is typically made of conducting polymer reinforced with nanoclays. The presence of nanoclays in this matrix is found to provide enhancements to the properties of the EMI shield films [7,11]. These are usually studied using the following tests that are shown in Table 2.…”

“…The insulating matrix can be divided into three categories thermoplastics, thermosetting plastics and elastomers. Based on our application some of the most commonly used insulating polymers are ethylene-vinyl-acetate (EVA) [11], polyetherimide (PEI) [7], polyvinylchloride (PVC) [10] and polystyrene.…”

“…At the beginning, the conventional metals have been used as EMI shielding materials. But, owing to high density, cost and corrosion problems associated with metals, alternative EMI shielding materials with desirable characteristics such as high absorption, superior mechanical strength, light weight and easy processability are being developed and reported in literature [7][8][9][10][11].…”

“…The physical and chemical properties of the conducting polymer composites can be enhanced by the inclusion of suitable nano additives. There are many types of nanoparticles that are used as reinforcement in the conducting polymer to enhance its shielding properties also namely carbon nanotubes (CNTs) [15], graphene [16], metal-based nanoparticles [17], magnetic nanoparticles [18], and also nanoclays [7,9,11].…”